Variable-Stroke Valve Drive With a Double Leg Spring

Abstract

A variable-stroke valve drive includes a double leg spring with a first spring leg and a second spring leg in a cylinder head of an internal combustion engine and a pivot lever. The pivot lever is supported on a guideway track of a guideway by a rolling element having a pivot point and the pivot lever, by way of a control track, is supported so as to be clearance-free on an intermediate element to a charge-cycle valve. The pivot lever is pivotable by a cam of a cam shaft for adjusting a stroke and the pivot point is displaceable parallel to the guideway track by an adjustment installation for adjusting a stroke height. The double leg spring in a central region forms an intermediate leg. A respective end of the first and second spring legs is formed to be largely parallel to a longitudinal axis of the double leg spring.

1 .- 4 . (canceled) 
     
     
         5 . A variable-stroke valve drive, comprising:
 a double leg spring with a first spring leg and a second spring leg in a cylinder head of an internal combustion engine; and   a pivot lever, wherein the pivot lever is supported on a guideway track of a guideway by a rolling element having a pivot point, wherein the pivot lever by way of a control track is supported so as to be clearance-free on an intermediate element to a charge-cycle valve, wherein the pivot lever is pivotable, counter to a force of the double leg spring, in a controlled manner by a cam of a cam shaft for adjusting a stroke, and wherein the pivot point is displaceable in a controlled manner parallel to the guideway track by an adjustment installation for adjusting a stroke height;   wherein the double leg spring in a central region of the double leg spring forms an intermediate leg having a reversal of a rotation direction of the first and second spring legs and wherein the double leg spring is able to be assembled in a region of the intermediate leg;   wherein a respective end of the first and second spring legs is formed to be largely parallel to a longitudinal axis of the double leg spring.   
     
     
         6 . The variable-stroke valve drive according to  claim 5 , wherein the respective end of the first and second spring legs is formed toward an inside or an outside of the variable-stroke valve drive. 
     
     
         7 . The variable-stroke valve drive according to  claim 5 , wherein the respective end of the first and second spring legs is bent approximately 90° with respect to the respective first and second spring leg. 
     
     
         8 . The variable-stroke valve drive according to  claim 5 , wherein the pivot lever has a respective contact face for the respective end of the first and second spring legs.